IOS

Objc uses block to implement chained programming and objcblock chained Programming Objc uses block to implement chained Programming 　　 　　Because it is hard to read. Like Anonymous functions in other languages, block is difficult for many programmers

For iOS development, you have to worry about data storage-dry goods, ios dry goods 1. preference settings-mostly used for user name, automatic login, and other data storage Many iOS apps support preference settings, such as saving user names,

IOS multithreading technology and ios Multithreading IOS multithreading technology mainly allocates NSThread, NSOperation, and GCD. Below is a brief introduction. Just a little more, not in order. So let's first introduce NSOperation. Export

Simple calendar and simple calendar 1. initialize some global variables 1 _gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];2 _calendarDate = [NSDate date];3 _dayInfoUnits =

Full solution of iOS UITextField, iOSUITextField // Initialize textfield and set the position and size UITextField * text = [[UITextField alloc] initWithFrame: CGRectMake (20, 20,130, 30)];   // Set the border style. The border style is displayed

[Reading Notes] iOS-reading text files and Reading Notes ios- 1. Content of a text file.   2. project directory     3. ViewController. m -(Void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view, typically from a

Note on the use of NSJSONSerialization in iOS, and the use of block in ios This is the first Json parsing method. Because it is easy to use and has a high resolution efficiency, NSJSONSerialization is the best choice for Json data parsing. Below is

How to draw dotted lines in IOSBecause the project needs to draw a dotted line, at first we want to use the picture to overlap. I collected a circle or encapsulated a UIView.The Code is as follows:. H file # Import @ Interface DashesLineView:

IOS UI14_GET-POST // // ViewController. m // UI14_GET-POST // // Created by dllo on 15/8/17. // Copyright (c) 2015 zhozhicheng. All rights reserved. //   # Import ViewController. h   @ Interface ViewController () -(IBAction) synGET :( id) sender; -

IOS project development practice-make view translation animations and solve moving exceptions Today, I tried to make a translation animation for the view and encountered some problems. Now I want to share it with you. Through the animation effect,

IOS project development practice-use user preference data API to store information Anyone who has developed Android knows that Content Provider, one of the four main components in Android, is a lightweight data storage component that stores simple

IOS live animation survey notesPreface Due to project requirements, I have been investigating the live animation of iOS recently. For me, this is a field that has not been too involved before. Therefore, it is necessary to record the survey process

Ios Bluetooth enable judgment 1. Add CoreBluetooth. framework 2. Introduce the. m file in the program # Import 3. Implementation Protocol CBPeripheralManagerDelegate, 4. Add attributes: @ Property (nonatomic, strong) CBPeripheralManager *

Use of speed sensors in iOS Many of our smartphones have built-in sensors. Many of our apps can develop more interactive applications based on sensor information. Now let's use and obtain the accelerometer in iOS. (1) The code is implemented as

Isnan function of iOS If a number is a definite number, it is not a nan value. If a number is infinite and infinitely small, it is the nan value. I tried to print whether the following values are nan values.   If (isnan (1 )){ DLog (@ 1 is NAN

IOS forces switching between screen and Landscape Recently, an html5 electronic Protocol is required, which involves signatures. The Portrait screen signature is not enough. Therefore, you need to switch the screen to the landscape screen. After the

IOS optimizes shadow code in the project 1. Optimize the shadow code in the project Currently, the following shadow code is used in projects, especially in table cells, to seriously affect the performance (the cause of choppy flight query result

IOS development-Carousel image module (continuous loop and rolling Version) // The ScrollView-based carousel module and the loop scroll // ViewController. m // Slider-Carousel-cyclic scrolling version /// Created by JamesXiang on 15/7/25. //

IOS-Precautions for local file and data security, and ios-Data Security 1. program file security. By obfuscation and encryption of the JavaScript source code, hackers can easily read and tamper with related logic, and prevent leakage of

Add watermarks to images in ios and ios UIGraphicsBeginImageContext (image1.size ); [Image1 drawInRect: CGRectMake (0, 0, image1.size. width, image1.size. height)]; [Image2 drawInRect: CGRectMake (image1.size. width-(image2.size. width * 0.5